Why not just blow him instead?
I did two weeks ago, then last week the taste was just too bitter. And he scrubbed his dick too. The only position comfortable for me to be blowing him is on my side and him on his side. Everything else either aches or hurts because of pressure on my belly/hips. I might try kneeling on the end of the bed next time.
Last night I had to lay with my back to him to play with his dick because leaning over (just slightly) was putting discomfort on my belly. So to get a good grip I had to reach behind me while he was laying behind me.
It ended up working out. He got a good handjob that led into sex. We did doggy, and he felt great. (we had to stop for a second once or twice tho, because my damn hip started cramping up)
He went to clean up and then I took care of myself. When he came back we snuggled.